Using sybase_deadlock_retry_count(), the number of retries can be defined in cases of deadlocks. By default, every deadlock is retried an infinite number of times or until the process is killed by Sybase, the executing script is killed (for instance, by set_time_limit()) or the query succeeds.
注: 本函数仅适用于 Sybase 的 CT 库接口，而不适用于 DB 库。